if the side panels are dimensioned in multiples of 32mm then the stops work from either end of the 32mm holey rail. You can use non-32mm dimensions, however you must always register the rail to either the top
only, or the bottom only of the panel. Just mark the chosen reference side accordingly and pay close and constant attention to registering the rails against the reference edge. This is not a concern when building side panels in multiples of 32 mm as registration will be inherently correct by design.
Likewise, if you are using the LR 32 to place Euro cup hinges on corresponding doors, the same method applies.....If 32mm multiples then both ends work, if not 32mm multiples, then always reference either top or bottom only for rail registration.